The Altai birch mouse (Sicista napaea) is a species of rodent in the family Sminthidae.

It is native to Russia and Kazakhstan.

[1] A baby Altai birch mouse is called a 'pinkie, kitten or pup'.

The females are called 'doe' and males 'buck'.

A Altai birch mouse group is called a 'nest, colony, harvest, horde or mischief'.